Feckfast 

Feckfast is having sex at breakfast.

Amy and Steve just had some lovely morning feckfast.

Feckfast by Okelly August 15, 2018

fecktastic 

from the root word meaning fuck and the seconday root meaning fantastic, they combine and make, fecktastic. Which is fucking fantastic.

Holy ballsack, pie if mfin fecktastic.

fecktastic by Marty Schneider July 19, 2004

fuckfast 

A slang word used to describe an alcoholic drink (tonic wine) known as "Buckfast" which is usually consumed by the bottle, resulting in quick intoxication.

Also referred to as "buckie" or "a bottle of b"

This drink is popular in Ireland and Scotland

Mike do you want to come for a drink tonight?

yeah, what are you having?

answer: fuckfast

fuckfast by Capall October 11, 2006